+A leech is a segmented [worm](/wiki/worm) of the phylum [Annelida](/wiki/annelida), known for its slender form and often a unique feeding method. Most inhabit freshwater, silently seeking a host to nourish themselves with blood, a practice sometimes utilized in [medicine](/wiki/medicine).
+## See also
+- [Blood](/wiki/blood)
+- [Parasitism](/wiki/parasitism)
+- [Freshwater](/wiki/freshwater)